Main Staircase for the Arts Club Chicago,1948-51 Steel, travertine marble 359.4 x 458.8 x 609.3 cm; 141 1/2 x 180 5/8 x 239 7/8 inches Arts Club commission 1948–1951 Ludwig Mies van der Rohe 109 East Ontario Street, Chicago, Illinois, 1951–1995 Repositioned by John Vinci 210 East Ontario Street, Chicao, Illinois, October 1, 1998